Consisting of a flat-surface drill-down base and universal diamond plate with hole pattern, the RAM Screw-Down Mount Base connects to any RAM and third-party cradles with the standard AMPS hole pattern. Patented rubber ball-and-socket system (1" diameter) with adjustment points at the base and cradle allows for almost infinite adjustment and perfect viewing angles. High-quality powder-coated Marine grade aluminum ensures safety, security, and accessibility. Dampens shock and vibration helping to extend the life of your device. 1" rubber ball, "B" size.